System for remotely checking locked status of a vehicle

1. A system for detecting locked status of a vehicle, said vehicle having an electrical power door lock system, said system for detecting comprising: a status transmitter configured to transmit a signal indicating said vehicle is in a locked status and having first input for coupling a lock voltage from said power door lock system, said lock voltage representative of a command to lock all vehicle doors; and a remote receiver responsive to said status transmitter and configured to indicate whether said vehicle is in the locked status based upon said signal; wherein said status transmitter further comprises a voltage detector coupled to said first input and configured to detect the polarity of said lock voltage; a second input to said status transmitter for coupling an unlock voltage from said power door lock system, said unlock voltage representative of a command to unlock all vehicle doors; and wherein said voltage detector is coupled to said second input and is configured to detect the polarity of said unlock voltage.

2. The system for detecting locked status of a vehicle of claim 1 , wherein said status transmitter is adapted to connect to a pre-existing electrical power door lock system in a vehicle.

3. The system for detecting locked status of a vehicle of claim 2 , wherein said first input comprises an electrical clamp for connecting said first input to said pre-existing system without making physical contact with any conductor comprised in said pre-existing system.

4. The system for detecting locked status of a vehicle of claim 2 , wherein each of said first and second inputs comprise an electrical clamp for connecting each of said first and second inputs to said pre-existing system without making physical contact with any conductor comprised in said pre-existing system.

5. A system for detecting locked status of a vehicle having a power door lock subsystem, said system for detection system comprising: a transmitter comprising: first and second inputs configured to be respectively connected to first and second leads in said power door lock subsystem, said first and second inputs, when so connected, respectively comprising a lock voltage representing a command to said power door lock subsystem to lock all vehicle doors and an unlock voltage representing a command to said power door lock subsystem to lock all vehicle doors; a voltage detector responsive to said first and second inputs and configured to detect the polarity of said lock and unlock voltages and outputting a signal representing said polarity; a transmitter controller configured to receive said signal and to output a status signal representing either one of a locked status and an unlocked status of said vehicle; a radio frequency module for wirelessly transmitting said status signal.

6. The system for detecting locked status of a vehicle of claim 5 , further comprising: a remote receiver responsive said transmitter and comprising: a radio frequency module compatibly configured to receive said status signal; a receiver controller configured to issue a command signal based upon whether the status signal represents either one of said locked status and said unlocked status; a display responsive to said command signal configured to visually indicate either one of said locked status and said unlocked status based upon said command signal.

7. The system for detecting locked status of a vehicle of claim 6 , wherein said status transmitter is configured to be non-integrally added to a pre-existing power door lock subsystem.

8. The system for detecting locked status of a vehicle of claim 7 , wherein said status transmitter is configured to be non-integrally added to said pre-existing power door lock subsystem without making physical contact with any conductors comprised within said subsystem.

9. The system for detecting locked status of a vehicle of claim 8 , further comprising electrical clamps terminating each of said first and second inputs and configured to clamp around said first and second leads.